From: Roy Marples <roy@marples.name>
Date: Mon, 27 Mar 2017 14:56:34 +0000 (+0100)
Subject: Fix a potential crash where the ARP state could be freed during processing.
X-Git-Tag: v6.11.6~5
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a017eae146151a5ffeefe23757a1bc703ddbfdcc;p=thirdparty%2Fdhcpcd.git

Fix a potential crash where the ARP state could be freed during processing.
---

diff --git a/arp.c b/arp.c
index 9943a212..bf1f4974 100644
--- a/arp.c
+++ b/arp.c
@@ -204,6 +204,9 @@ arp_read(void *arg)
 			return;
 		}
 		arp_packet(ifp, buf, (size_t)bytes);
+		/* Check we still have a state after processing. */
+		if ((state = ARP_CSTATE(ifp)) == NULL || state->fd == -1)
+			break;
 	}
 }